hexify_icosa_tri_to_quad_ij: Convert Icosa Triangle to Quad IJ coordinates

In hexify: Equal-Area Hex Grids on the 'Snyder' 'ISEA' 'Icosahedron'

Convert Icosa Triangle to Quad IJ coordinates

Description

Converts icosahedral triangle coordinates directly to Quad IJ, combining the transformation and quantization steps.

Usage

hexify_icosa_tri_to_quad_ij(
  icosa_triangle_face,
  icosa_triangle_x,
  icosa_triangle_y,
  resolution,
  aperture = 3L
)

Arguments

icosa_triangle_face	Triangle face number (0-19)
icosa_triangle_x	X coordinate on triangle face
icosa_triangle_y	Y coordinate on triangle face
resolution	Grid resolution level
aperture	Grid aperture: 3, 4, or 7

Value

List with components:

quad	Quad number (0-11)
i	Integer cell index along first axis
j	Integer cell index along second axis

See Also

Other coordinate conversion: hexify_cell_id_to_quad_ij(), hexify_cell_to_icosa_tri(), hexify_cell_to_lonlat(), hexify_cell_to_plane(), hexify_cell_to_quad_ij(), hexify_cell_to_quad_xy(), hexify_grid_cell_to_lonlat(), hexify_grid_to_cell(), hexify_icosa_tri_to_plane(), hexify_icosa_tri_to_quad_xy(), hexify_lonlat_to_cell(), hexify_lonlat_to_plane(), hexify_lonlat_to_quad_ij(), hexify_quad_ij_to_cell(), hexify_quad_ij_to_icosa_tri(), hexify_quad_ij_to_xy(), hexify_quad_xy_to_cell(), hexify_quad_xy_to_icosa_tri(), hexify_roundtrip_test()

Examples

# First get triangle coordinates from lon/lat
fwd <- hexify_forward(lon = 2.35, lat = 48.86)

# Then convert to quad IJ
quad_ij <- hexify_icosa_tri_to_quad_ij(
  icosa_triangle_face = fwd["face"],
  icosa_triangle_x = fwd["icosa_triangle_x"],
  icosa_triangle_y = fwd["icosa_triangle_y"],
  resolution = 10,
  aperture = 3
)
print(quad_ij)

hexify documentation built on March 1, 2026, 1:07 a.m.